I sent the letters (forms) to CAA and FAA about 21 December and collected my "based on" in Denver on Feb 26th 2007.
I had had my letter from the FAA in Surrey about 3 weeks prior to that.
(The shame was that Denver didn't have a copy and I had to get Oaklahoma City to fax it to Denver .. but it was all done in a couple of hours).
The Orville and Wilbur club membership card arrived back in Surrey about beginning of April.
DGG